Duct tape will also leave behind sticky goo that will probably gather sand & dirt and make rotation worse.

I have sometimes (years ago) used spray paint on masts to reduce wear on the epoxy & carbon of the mast, especially in the joint between the two parts, but also where the cams touch the mast. Dry teflon spray coating is also good (but expensive and potentially hard to find). Wet teflon spray isn't as good IMHO.